ebrary, Inc, Tweeten, L. G., & Thompson, S. R. (2002). Agricultural policy for the 21st century. Iowa State Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रebrary, Inc, Luther G. Tweeten, और Stanley R. Thompson. Agricultural Policy for the 21st Century. Ames: Iowa State Press, 2002.
एमएलए (9वां संस्करण) प्रशस्ति पत्रebrary, Inc, et al. Agricultural Policy for the 21st Century. Iowa State Press, 2002.
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